An Internet company wants a federal appeals panel to help disarm lawyers for the music industry, blocking them from using special copyright subpoenas in a campaign to track and sue computer users who download songs online.

Verizon Communications Inc. is challenging the constitutionality of the subpoenas under the 1998 Digital Millennium Copyright Act. A trial judge, John D. Bates, earlier had approved use of the subpoenas, forcing Verizon to turn over names and addresses for at least four Internet subscribers.

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